/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/Apache-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *
 */


package com.tencent.angel.ml.tree.conf

/**
  * Enum for selecting the quantile calculation strategy
  */
object QuantileStrategy extends Enumeration {

  type QuantileStrategy = Value

  val Sort, MinMax, ApproxHist = Value

  def fromString(name: String): QuantileStrategy = name.toLowerCase match {
    case "sort" => Sort
    case "minmax" => MinMax
    case "approx" | "approxhist" => ApproxHist
    case _ => throw new IllegalArgumentException(s"Did not recognize QuantileStrategy name: $name")
  }
}
